Microchip Technology TC1303B-IA0EMFTR

Overview

TC1303B-IA0EMFTR from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO), with power-good monitoring specifically of the LDO output. It delivers 1.8V at 500 mA (buck) and 3.3V at 300 mA (LDO), features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303B-IA0EMFTR datasheet, TC1303B-IA0EMFTR pinout, TC1303B-IA0EMFTR application, or TC1303B-IA0EMFTR equivalent, key selection criteria include LDO-monitored PG output, independent shutdown control per rail, 137 mV dropout at 200 mA, internal compensation, and DFN/MSOP package compatibility in space-constrained battery-powered systems.

Technical Context

The TC1303B-IA0EMFTR implements a synchronous buck stage with PFM/PWM auto-transition for light/heavy load efficiency optimization, and a separate LDO stage with single 1 µF ceramic output capacitor support. Its power-good circuitry actively monitors only VOUT2 regulation, asserting a push-pull PG signal when VOUT2 reaches ≥94% of nominal value with 300 ms delay-designed for processor reset timing coordination.

Shutdown logic is fully independent: SHDN1 controls the buck regulator, SHDN2 controls the LDO, enabling flexible power sequencing without external logic. Both regulators are internally compensated and support adjustable (0.8–4.5 V) or factory-fixed output voltages, with UVLO, overtemperature, and short-circuit protection integrated on both outputs.

Key Specifications

Pinout & Package

TC1303B-IA0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), requiring connection to AGND for optimal thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output PMIC applications.

Compared with TC1303A-IA0EMFTR and TPS65023RGZR, TC1303B-IA0EMFTR uniquely provides LDO-monitored push-pull PG in a minimal 10-pin DFN, optimizing simplicity and board area for cost-sensitive portable medical and USB devices where only two fixed outputs and deterministic reset timing are needed.

Availability

TC1303B-IA0EMFTR is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial portable terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TC1303B-IA0EMFTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.

The TC1303 family was designed to deliver highly integrated, low-quiescent-current dual-rail power solutions for space- and battery-constrained portable electronics, emphasizing simplicity, reliability, and minimal external component count.

FAQ

What output voltages does the TC1303B-IA0EMFTR provide?

The TC1303B-IA0EMFTR provides a fixed 1.8 V output from its 500 mA synchronous buck regulator and a fixed 3.3 V output from its 300 mA low-dropout linear regulator. These values are factory-set and do not require external feedback resistors. The part number suffix "IA0" explicitly denotes the 1.8 V / 3.3 V configuration, and the datasheet confirms VOUT1 = 1.8 V and VOUT2 = 3.3 V under all operating conditions.

How does the power-good (PG) function work on the TC1303B-IA0EMFTR?

The TC1303B-IA0EMFTR's PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal 3.3 V value, with a built-in 300 ms delay to ensure stable regulation before signaling readiness. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored, open-drain) and TC1303C (dual-monitored).

Can the TC1303B-IA0EMFTR operate from a single 3.7 V Li-ion cell?

Yes, the TC1303B-IA0EMFTR supports input voltages from 2.7 V to 5.5 V, making it compatible with a single Li-ion cell across its full discharge range (typically 4.2 V to 3.0 V). At 3.0 V input, the 3.3 V LDO remains functional only if the dropout requirement is met-however, since VOUT2 = 3.3 V and dropout is 137 mV at 200 mA, minimum VIN is 3.437 V; thus, the LDO drops out below ~3.45 V, while the buck continues regulating 1.8 V down to 2.7 V.

What is the thermal performance of the TC1303B-IA0EMFTR in the DFN package?

In its 10-pin 3×3 mm DFN package with exposed pad, the TC1303B-IA0EMFTR has a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the pad. This enables continuous 500 mA buck and 300 mA LDO operation up to +85°C ambient when the EP is soldered to AGND, with thermal shutdown activating at 165°C junction temperature.

Does the TC1303B-IA0EMFTR require external compensation components?

No, the TC1303B-IA0EMFTR features fully internal compensation for both the buck and LDO regulators. This eliminates the need for external RC networks or compensation capacitors, reducing bill-of-materials cost and PCB area. The datasheet explicitly states "Both Outputs Internally Compensated" and validates stability with only the recommended input/output capacitors (4.7 µF and 1 µF ceramic, respectively).